Honors physics intermediate force question

1. The problem statement, all variables and given/known data
Question: An object traveling at a constant speed of 22m/s begins to experience a force of 15N in the opposite direction of its motion. (Hint given: Start by finding objects acceleration)

a. How long will it take for the 8kg object to come to a complete stop once it experiences the force?
b. If the object was traveling in a straight line, how far did the object travel as it slowed down?

2. Relevant equations
I am not exactly sure what the relevant equations are for this problem but here are the equations we have used so far in this unit.

I am guessing that I have to use one of those equations.3. The attempt at a solution
Here is my small attempt.
F=ma
15N=(8g)(a)
a=1.875m/s^2

This is where I get stuck. First off I don't even know if the value I got for acceleration is correct and secondly where do I go from here. Do I go back to my kinematics equations to find time in part "a" and X in part "b"?

Staff: Mentor

This is where I get stuck. First off I don't even know if the value I got for acceleration is correct and secondly where do I go from here. Do I go back to my kinematics equations to find time in part "a" and X in part "b"?

Your acceleration is correct. And yes, time to dust off the kinematics equations to answer the questions.